content: /* Copyright (C) 2016-2018 Alibaba Group Holding Limited
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  
  /*
   * Protocol Buffers - Google's data interchange format
   * Copyright 2014 Google Inc.  All rights reserved.
   * https://developers.google.com/protocol-buffers/
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package com.google.protobuf.jruby;
  
  import com.google.protobuf.Descriptors;
  import org.jruby.*;
  import org.jruby.anno.JRubyClass;
  import org.jruby.anno.JRubyMethod;
  import org.jruby.runtime.Binding;
  import org.jruby.runtime.Block;
  import org.jruby.runtime.ObjectAllocator;
  import org.jruby.runtime.ThreadContext;
  import org.jruby.runtime.builtin.IRubyObject;
  
  @JRubyClass(name = "MessageBuilderContext")
  public class RubyMessageBuilderContext extends RubyObject {
      public static void createRubyMessageBuilderContext(Ruby runtime) {
          RubyModule protobuf = runtime.getClassFromPath("Google::Protobuf");
          RubyClass cMessageBuilderContext = protobuf.defineClassUnder("MessageBuilderContext", runtime.getObject(), new ObjectAllocator() {
              @Override
              public IRubyObject allocate(Ruby runtime, RubyClass klazz) {
                  return new RubyMessageBuilderContext(runtime, klazz);
              }
          });
          cMessageBuilderContext.defineAnnotatedMethods(RubyMessageBuilderContext.class);
      }
  
      public RubyMessageBuilderContext(Ruby ruby, RubyClass klazz) {
          super(ruby, klazz);
      }
  
      @JRubyMethod
      public IRubyObject initialize(ThreadContext context, IRubyObject descriptor, IRubyObject rubyBuilder) {
          this.cFieldDescriptor = (RubyClass) context.runtime.getClassFromPath("Google::Protobuf::FieldDescriptor");
          this.cDescriptor = (RubyClass) context.runtime.getClassFromPath("Google::Protobuf::Descriptor");
          this.cOneofDescriptor = (RubyClass) context.runtime.getClassFromPath("Google::Protobuf::OneofDescriptor");
          this.cOneofBuilderContext = (RubyClass) context.runtime.getClassFromPath("Google::Protobuf::Internal::OneofBuilderContext");
          this.descriptor = (RubyDescriptor) descriptor;
          this.builder = (RubyBuilder) rubyBuilder;
          return this;
      }
  
      /*
       * call-seq:
       *     MessageBuilderContext.optional(name, type, number, type_class = nil)
       *
       * Defines a new optional field on this message type with the given type, tag
       * number, and type class (for message and enum fields). The type must be a Ruby
       * symbol (as accepted by FieldDescriptor#type=) and the type_class must be a
       * string, if present (as accepted by FieldDescriptor#submsg_name=).
       */
      @JRubyMethod(required = 3, optional = 1)
      public IRubyObject optional(ThreadContext context, IRubyObject[] args) {
          Ruby runtime = context.runtime;
          IRubyObject typeClass = runtime.getNil();
          if (args.length > 3) typeClass = args[3];
          msgdefAddField(context, "optional", args[0], args[1], args[2], typeClass);
          return context.runtime.getNil();
      }
  
      /*
       * call-seq:
       *     MessageBuilderContext.required(name, type, number, type_class = nil)
       *
       * Defines a new required field on this message type with the given type, tag
       * number, and type class (for message and enum fields). The type must be a Ruby
       * symbol (as accepted by FieldDescriptor#type=) and the type_class must be a
       * string, if present (as accepted by FieldDescriptor#submsg_name=).
       *
       * Proto3 does not have required fields, but this method exists for
       * completeness. Any attempt to add a message type with required fields to a
       * pool will currently result in an error.
       */
      @JRubyMethod(required = 3, optional = 1)
      public IRubyObject required(ThreadContext context, IRubyObject[] args) {
          IRubyObject typeClass = context.runtime.getNil();
          if (args.length > 3) typeClass = args[3];
          msgdefAddField(context, "required", args[0], args[1], args[2], typeClass);
          return context.runtime.getNil();
      }
  
      /*
       * call-seq:
       *     MessageBuilderContext.repeated(name, type, number, type_class = nil)
       *
       * Defines a new repeated field on this message type with the given type, tag
       * number, and type class (for message and enum fields). The type must be a Ruby
       * symbol (as accepted by FieldDescriptor#type=) and the type_class must be a
       * string, if present (as accepted by FieldDescriptor#submsg_name=).
       */
      @JRubyMethod(required = 3, optional = 1)
      public IRubyObject repeated(ThreadContext context, IRubyObject[] args) {
          IRubyObject typeClass = context.runtime.getNil();
          if (args.length > 3) typeClass = args[3];
          msgdefAddField(context, "repeated", args[0], args[1], args[2], typeClass);
          return context.runtime.getNil();
      }
  
      /*
       * call-seq:
       *     MessageBuilderContext.map(name, key_type, value_type, number,
       *                               value_type_class = nil)
       *
       * Defines a new map field on this message type with the given key and value
       * types, tag number, and type class (for message and enum value types). The key
       * type must be :int32/:uint32/:int64/:uint64, :bool, or :string. The value type
       * type must be a Ruby symbol (as accepted by FieldDescriptor#type=) and the
       * type_class must be a string, if present (as accepted by
       * FieldDescriptor#submsg_name=).
       */
      @JRubyMethod(required = 4, optional = 1)
      public IRubyObject map(ThreadContext context, IRubyObject[] args) {
          Ruby runtime = context.runtime;
          IRubyObject name = args[0];
          IRubyObject keyType = args[1];
          IRubyObject valueType = args[2];
          IRubyObject number = args[3];
          IRubyObject typeClass = args.length > 4 ? args[4] : context.runtime.getNil();
  
          // Validate the key type. We can't accept enums, messages, or floats/doubles
          // as map keys. (We exclude these explicitly, and the field-descriptor setter
          // below then ensures that the type is one of the remaining valid options.)
          if (keyType.equals(RubySymbol.newSymbol(runtime, "float")) ||
                  keyType.equals(RubySymbol.newSymbol(runtime, "double")) ||
                  keyType.equals(RubySymbol.newSymbol(runtime, "enum")) ||
                  keyType.equals(RubySymbol.newSymbol(runtime, "message")))
              throw runtime.newArgumentError("Cannot add a map field with a float, double, enum, or message type.");
  
          // Create a new message descriptor for the map entry message, and create a
          // repeated submessage field here with that type.
          RubyDescriptor mapentryDesc = (RubyDescriptor) cDescriptor.newInstance(context, Block.NULL_BLOCK);
          IRubyObject mapentryDescName = RubySymbol.newSymbol(runtime, name).id2name(context);
          mapentryDesc.setName(context, mapentryDescName);
          mapentryDesc.setMapEntry(true);
  
          //optional <type> key = 1;
          RubyFieldDescriptor keyField = (RubyFieldDescriptor) cFieldDescriptor.newInstance(context, Block.NULL_BLOCK);
          keyField.setName(context, runtime.newString("key"));
          keyField.setLabel(context, RubySymbol.newSymbol(runtime, "optional"));
          keyField.setNumber(context, runtime.newFixnum(1));
          keyField.setType(context, keyType);
          mapentryDesc.addField(context, keyField);
  
          //optional <type> value = 2;
          RubyFieldDescriptor valueField = (RubyFieldDescriptor) cFieldDescriptor.newInstance(context, Block.NULL_BLOCK);
          valueField.setName(context, runtime.newString("value"));
          valueField.setLabel(context, RubySymbol.newSymbol(runtime, "optional"));
          valueField.setNumber(context, runtime.newFixnum(2));
          valueField.setType(context, valueType);
          if (! typeClass.isNil()) valueField.setSubmsgName(context, typeClass);
          mapentryDesc.addField(context, valueField);
  
          // Add the map-entry message type to the current builder, and use the type to
          // create the map field itself.
          this.builder.pendingList.add(mapentryDesc);
  
          msgdefAddField(context, "repeated", name, runtime.newSymbol("message"), number, mapentryDescName);
          return runtime.getNil();
      }
  
      @JRubyMethod
      public IRubyObject oneof(ThreadContext context, IRubyObject name, Block block) {
          RubyOneofDescriptor oneofdef = (RubyOneofDescriptor)
                  cOneofDescriptor.newInstance(context, Block.NULL_BLOCK);
          RubyOneofBuilderContext ctx = (RubyOneofBuilderContext)
                  cOneofBuilderContext.newInstance(context, oneofdef, Block.NULL_BLOCK);
          oneofdef.setName(context, name);
          Binding binding = block.getBinding();
          binding.setSelf(ctx);
          block.yieldSpecific(context);
          descriptor.addOneof(context, oneofdef);
          return context.runtime.getNil();
      }
  
      private void msgdefAddField(ThreadContext context, String label, IRubyObject name,
                                  IRubyObject type, IRubyObject number, IRubyObject typeClass) {
          descriptor.addField(context,
                  Utils.msgdefCreateField(context, label, name, type, number, typeClass, cFieldDescriptor));
      }
  
      private RubyDescriptor descriptor;
      private RubyBuilder builder;
      private RubyClass cFieldDescriptor;
      private RubyClass cOneofDescriptor;
      private RubyClass cOneofBuilderContext;
      private RubyClass cDescriptor;
  }
  